What type of device do most modern aircraft use instead of fuses to protect their electrical circuits?

Most modern aircraft utilize circuit breakers to protect their electrical circuits instead of fuses. Circuit breakers offer a significant advantage over traditional fuses because they can be reset and reused after an overload or short circuit has occurred. This feature reduces downtime and maintenance, as it eliminates the need to replace fuses each time a fault is detected.

In modern aviation systems, circuit breakers are designed to automatically interrupt the flow of electricity in case of overcurrent conditions, and many are equipped with visual indicators that help pilots and maintenance personnel quickly identify which circuits have tripped. This system enhances safety and reliability in electrical management within the aircraft.

Other options, such as fuse links and circuit boards, do not serve the same purpose or offer the same functionality as circuit breakers. Fuse links are more traditional solutions that need replacing after a fault, while circuit boards refer to the physical structures that house electronic components but do not perform circuit protection functions directly. Safety switches are generally used to prevent equipment operation under unsafe conditions rather than protecting electrical circuits directly.